Method of securing an apertured member to a cylindrical member.



.e. M. BENNETT.

METHOD OF SECURING AN APERTURED MEMBER TOJA CYLINDRIGAL MEMBER.

APPLICATION FILED JULY 21. I914.

L157,666.. E Patented Oct. 25, 1915.

uNrn STATES rnr au orrion.

sEoaGnM. BENNETT, or IVKENOSHA, WISCONSIN.

METHOD OF SECURING AN APERTURED MEMBER TO A CYLINDRICAL MEMFER.

PatentedOct. 26, 1915..

Application filed July 27, 1914. Serial No. 853,339.

T all whom it may concern:

Be it known that I, GEORGE M. BENNET'I, a subject of the King of GreatBritain, and a resident of the city of Kenosha, county of Kenosha, andState of \Visconsin, have invented certain new and useful Improvementsin Methods of Securing an Apertured Member to a Cylindrical Member, ofwhich the following isa specification. I

This invention relates to improvements in methods of securing anapertured member to a cylindrical member, and refers more particularlyto the securing of collars, rings,

wheels, pulleys, gears and the like. to a shaft,

the material from either or both of said surfaces; to provide aconstruction in which to accomplish the foregoing object, the pe ripheryof one of said members is-provided with a series of longitudinallyextending serrations or dentations formed circumferentially around saidperiphery and formed by nurling, milling, rolling or otherwise; toprovide a construction in which preferably the apertured member isforced onto the cylindrical member, the cylindrical'member being ofgreater diameter than said apertured member, so that said serrations ordentations become embedded in and interlock with the opposed peripheryof the other member; to provide a construction which is moreparticularly adapted for locking of metallic members; to provide aconstruction in which the metalof said members is utilized as a lockingelement without removal of any appreciable amount of the metal fromeither of said members, and in which this may be accomplished Withoutessentially weakening either member; to provide a simple and economicalmethod of accomplishing the foregoing objects, and in gen.- eral toprovide a novel method of the character described.

My invention consists in the matters hereinafter described and moreparticularly pointed out in the appended claim.

In the draWingsFigure 1 is a side elevatlon of a fly wheel. Fig. 2 is afragmentary perspective view of a plain shaft. F ig. 3 is a view similarto Fig. 2 but showing part of the periphery of said shaft provided witha series of longitudinally extending serratlons or dentations. Fig. 4 isa sectional view taken on lines 4.4 of Fig. 3. Fig. 5 is a sectionalview of the fly wheel showing the parts in assembled position. Fig. 6 isa sectional view of the hub showing the shaft removed. Fig. 7 is a sideelevation of a gear in which its inner periphery is provided withlongitudinally extending serrations. Fig. 8 shows this gear in positionon a plain shaft.

As is well known, the common method of securing a wheel, pulley, gear orthe like, to a shaft so as to lock the members against independentrotative movement, is by means of a key and key-ways. These membershavebeen also secured together by such extraneous fastening devices asclamps, set screws, pins and the like, and also by shrinking thegear,'.pulley or other member on the shaft. All of these variousfastening de- 'vices or methods are useful for certain purposes, and arealso open to certain objections as is well known. My invention is moreparticularly adapted to take the place of the keys and key-ways,although there are many instances in which it may be better than any ofthe other methods mentioned.

One of the objections to keying a pulley or gear to a shaft is that itis necessary to cut out the key-ways, which results in the removal of amaterial amount of metal, and to this extent weakening both the shaftand the hub. Again, if it is desirable to shift the hub on the shaft asmall distance it is necessary to extend the key-Way. This results infurther cutting of themetal and also leaves the old key-way notreinforced by the hub. Difficulty is also experienced in getting a fullbearing surface. In practice there is an approximate standard size ofkey for a shaft of given diameter. This means that there is a practicallimit to the bearing surface.

In the present invention it has been found in practice that a maximumbearing surface may be'obtained without removing substan;

tially any metal from either member. For,

example, in a 3 shaft the approximate standard key would be &" wide and5 deep. The amount of me tal removed from each member to form thekey-wayqis approximately I wide by 1 deep. Hence the effective bearingsurface is approximately In the present invention no appreciable amountof metal is removed, and the sum total of the bearing surface isapproximately 2 inches. I This is when the serrations are each .010 ofan inch deep. It

" of the shaft enter and become embedded in i i is obvious that a muchmore efiective bearmg surface is obtained 1n my lnventlon, and

also that it is much less expensive than the amount of metal. -Theirdepth will dependsomewhat upon the diameter of the shaft.

In the practice of my invention I ha"e found that the serrations on a 3shaft are preferably .010 of'an inch, and are preferably at an angle of4:5degrees to the axis of the shaft, although the foregoing may perhapsbe varied to meet conditions. This gives a total bearing surface ofapproximately 2.

inches. It is obvious that the diameter of the serrated shaft must belarger than the internal diameter of the hub. This is of coursenecessary in order to make the interlockmg connections heretoforereferred to The members are united by forcing the serrated shaft lntothe hub. The serrations the inner surface of the hub. It is to beunderstood that in the present instance the present invention.

hub is of softer metal than the serrations- "in the. shaft. The twomembers are now securely united against independent .rotative movementsolely by the interlocking engagement between the serrations of the.shaft and the opposed surface of the hub.

In Figs. 7 and 8 the serrations 5. are

formed in the' hub 2 of a gearl, and this serrated hub is forced over aplain shaft 4f in the manner heretofore described. The interlockingengagement of the two members is of course just the reverse of theconstruction shown in Figs. 1 to 6.

It is to be understood of course that I have merely shown twoapplications of the It is obviously applicable for a wide variety ofuses; and in its broader aspects is notlimited tothe details ofconstruction shown or the specific method here above described, exceptas set forth in the appended claim. For example, the gear serrated asshown in Fig. 7. might be put on a shaft previously serrated as shown inFig.

3 and still obtain the interlocking connections in question. This isespecially so if the metal of the hub of the gear shown in .Fig. 7 isof'substantially the same density or'hardness as the metal forming theshaft.

I claim as my invention: The method ,of securing an apertured member toa cylindrical member to interlock said members against independentrotation, which comprises displacing the surface of one of said membersto'provide pro- Jectmg serrations thus malntaining substantially thesame amount of material in the portion of the member operated upon,v

and interlocking the serrations thus formed with the adjacent surface'ofthe other member by forcing the cylindrical member into the aperturedmember. I

a GEORGE M. BENNETT.

Witnesses:

C. B. BELKNAP, E. M. -KLA'roHER.-

